Screw-beaded sheet-metal pipe



(No Model.)

A. M. SOUTHARD. sonnw BEADED SHEET METAL PIPE.

No. 467,999. PatentedFeb. 2, 1892.

WITNESSES: l/VVEA/T I? ATTORNEY.

UNITED STATES PATENT OFFICE.

ABRAHAM M. SOUTIIARD, OF DENVER, COLORADO, ASSIGNOR TO THE NATIONALSHEET METAL SOREVV PIPE COMPANY, OF COLORADO.

SCREW-BEADED SHEET-METAL PIPE.

SEECIFICATION forming part of Letters Patent No. 467,999, dated February2, 1892.

Application filed March 30, 1891. Serial No. 386,897. (No model.)

To (tZZ it-71 0711 it may concern:

Be it known that I, ABRAHAM M. SOUTHARD, a citizen of the United Statesof America, residing at Denver, in the county of Arapahoe and State ofColorado, have invented certain new and useful Improvements inScrewleaded Sheet-Metal Pipes; and Ido declare the following to be afull, clear,and exact description of the invention, such as will enableothers skilledin the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to thefigures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in sheet-metal pipes or tubes, andparticularly to screw-beaded pipe for shipment in knockdown shape. Thisscrew beaded pipe is formed with screw-beads upon the joiningextremities of the sections by the use of the screw-beading machine forwhich application for patent was made by George V. Smith and myselfjointly, said application having been filed September 10,1890, andallowed October 30, 1890, Serial No. 365,190.

It is well known to those who handle sheetmetal pipe, particularlystove-pipe, that all such pipe is shipped from thefactory in theso-called knockdown shape-that is, with the longitudinal joint-s open,so that the sections can be telesooped together, whereby a number ofthem are made to occupy the same or but little more space than a singlesection with the longitudinal joints closed. This will be readilyunderstood, and though only for convenience in shipping this knockdownfeature is absolutely indispensable in order to make sheet-metal pipes acommercial article.

In preparing this pipe for shipment the longitudinal opposite edges ofthe pipe are turned in opposite directionsthat is, one out and the otherinso that they will lock together and may be pressed down into a perfectjoint or seam with but little trouble after they are received by theretail dealer. It was found that by forming screw-beads upon theextremities of this pipe in knockdown shape these beaded edges wouldhave to be dispensed with because hooked edges could never be formedinto an interlocking joint after the screw-bead was formed. Hence thematerial which would have formed these hooked edges was at first cutoffat the eXtrem-' ity of the section preparatory to forming thescrew-bead,s0 that when the longitudinaljoint v of the section wasformed the screw-beaded edges simply came together or met withoutforminga connectedjoint. This leftthe pipe weak at the extremities andeasily disjoined or separated by a longitudinal pull, making thescrew-joint butlittle more secure than the ordinary sliding joint. Toovercome this difiiculty is the object of my present invention, and thisI accomplish by leaving the material of the pipe intact for the width ofthe screw-bead, whereby the screw-beaded edges overlap when thelongitudinal joint is complete, thus making the joint at theseextremities suficiently secure for all practical purposes, andin fact assecure as any other part of the longitudinal joint.

The invention will be fully understood by reference to the accompanyingdrawings, in which- Figure 1 is a top view of a section of screwbeadedpipe in knockdown shape ready for shipment and embodying my invention.Fig. 2 is an end view of the same. Fig. 3 is a top View of the same withthe longitudinal joint formed, the pipe being ready for use. Fig. l isan end View of the same. Fig.5 is an end View of a piece of pipe,showing the usual method of forming the edge joint. Fig. 6 illustratesthe manner of shipping these pipe-sections in knockdown shape.

In the views, wherein similar reference characters indicatecorresponding parts, let the numeral 10 designate the overturned hookedges, one edge being turned outward, as shown in full lines, and theother inward, as shown in dotted lines in Fig. 1. The broken lines 1Oshow the position of these edges before they are overturned.

The numeral 15 designates the space left by cutting out a triangularportion of the metal at the edge between the body portion of the pipeand the extremity upon which the screw-bead is formed. The edges of thisbody portion are then overturned, as shown at 10, leaving theprojections 25. It will be chserved that it is not necessary to cut outthe material, as shown at 15, since simply cutting through it willanswer every purpose, as the edges 10 can then be turned over, as shown.It is thought preferable, however, to cut out a small piece of metal, asit does away with sharp corners and makes the work smoother and neater.Thescrew-bead 20 is then formed, when the pipe is ready for shipment, inthe same manner as the old style of pipe illustrated in Fig. 6.

The section illustrated in Fig. 1 is joined at the edges, as shown inFig. 3, by hooking edges 10 together and pressing them down smooth, whenprojections 25 overlap, forming a beaded joint sufficient-1y smooth forall practical purposes. The inner extremity of two sections forming ascrew-joint is secured by a rivetBO, as shown in Figs. '3 and at. Thisgives additional security and prevents any possible danger of thescrew-joint being separated except by unscrewing.

A new article of manufacture consisting;

of sheet-metal pipe-sections having screwbeaded extremities, thelongitudinal edges of each section being united in an interlocking jointin the body of the section and in an overlapping joint at thescrew-beaded extremities, the overlapping portion of the joint beingsecured by a rivet and formed without crossing the edges, whereby itbecomes practicable to ship the sections in knockdown shape andafterward unite the edges of these sections and then joint theirextremities in continuous pipe-lengths, as set forth.

Intestimony whereof I affix my signature in presence of two witnesses.

ABRAHAM M. SOUTHARD.

' Witnesses:

'WM. M CCONNELL, LoUIs E. P. WILKEs.

